docs: fix priority values and permalink in FAQ doc

[kayx23]

Type of change:

• Bugfix
• New feature provided
• Improve performance
• Backport patches
• Documentation
• Refactor
• Chore
• CI/CD or Tests

What this PR does / why we need it:

Fix priority value and permalink in FAQ doc.

Pre-submission checklist:

• Did you explain what problem does this PR solve? Or what new features have been added?
• Have you added corresponding test cases?
• Have you modified the corresponding document?
• Is this PR backward compatible? If it is not backward compatible, please discuss on the mailing list first

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[github-actions]

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[Copilot]

Pull request overview

Updates the English FAQ documentation around route priority behavior to correct the referenced HTTPRoute priority implementation and the numeric guidance for choosing an APISIXRoute priority value.

Changes:

• Updates the HTTPRoute priority reference link to point at the current calculateHTTPRoutePriority implementation.
• Adjusts the documented APISIXRoute priority value needed to outrank HTTPRoute-derived routes.

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[Copilot]

Pull request overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated 2 comments.